ASPNET MVC - 当该字段确实有值时，为什么 ModelState.IsValid 为 false“x 字段是必需的”

为什么ModelState.IsValid在字段有值时为false？

csharp
public class Person
{
    [Required(ErrorMessage = "Name is required")]
    public string Name { get; set; }
}

csharp
public class HomeController : Controller
{
    public ActionResult Index()
    {
        var person = new Person();
        return View(person);
    }
    [HttpPost]
    public ActionResult Index(Person person)
    {
        if (ModelState.IsValid)
        {
            // 执行逻辑
            return RedirectToAction("Success");
        }
        return View(person);
    }
    public ActionResult Success()
    {
        return View();
    }
}

html
@model Person
@using (Html.BeginForm())
{
    @Html.LabelFor(m => m.Name)
    @Html.TextBoxFor(m => m.Name)
    @Html.ValidationMessageFor(m => m.Name)
    
}

csharp
[HttpPost]
public ActionResult Index(Person person)
{
    ModelState.Remove("Name"); // 删除Name字段的验证错误
    if (ModelState.IsValid)
    {
        // 执行逻辑
        return RedirectToAction("Success");
    }
    return View(person);
}